Z68 boards are what people are buying now. Anything with the features you need from Asus, Gigabyte , Asrock or MSI will do the job. If you are not overclocking you can drop down to the none K 2500 unless you are after the HD3000 integrated GPU.
Best answer selected by AbdullahG.
If your operating system is OEM and you upgrade the mobo, I think you will need to get a new operating system. I think the operating system is linked to the mobo.